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/* SPDX-License-Identifier: MIT */
/*
* Description: test that io-wq affinity is correctly set for SQPOLL
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include "liburing.h"
#include "helpers.h"
#define IOWQ_CPU 0
#define SQPOLL_CPU 1
static int verify_comm(pid_t pid, const char *name, int cpu)
{
char comm[64], buf[64];
cpu_set_t set;
int fd, ret;
sprintf(comm, "/proc/%d/comm", pid);
fd = open(comm, O_RDONLY);
if (fd < 0) {
perror("open");
return T_EXIT_SKIP;
}
ret = read(fd, buf, sizeof(buf));
if (ret < 0) {
close(fd);
return T_EXIT_SKIP;
}
if (strncmp(buf, name, strlen(name) - 1)) {
close(fd);
return T_EXIT_SKIP;
}
close(fd);
ret = sched_getaffinity(pid, sizeof(set), &set);
if (ret < 0) {
perror("sched_getaffinity");
return T_EXIT_SKIP;
}
if (CPU_COUNT(&set) != 1) {
fprintf(stderr, "More than one CPU set in mask\n");
return T_EXIT_FAIL;
}
if (!CPU_ISSET(cpu, &set)) {
fprintf(stderr, "Wrong CPU set in mask\n");
return T_EXIT_FAIL;
}
return T_EXIT_PASS;
}
static int verify_affinity(pid_t pid, int sqpoll)
{
pid_t wq_pid, sqpoll_pid = -1;
char name[64];
int ret;
wq_pid = pid + 2;
if (sqpoll)
sqpoll_pid = pid + 1;
/* verify we had the pids right */
sprintf(name, "iou-wrk-%d", pid);
ret = verify_comm(wq_pid, name, IOWQ_CPU);
if (ret != T_EXIT_PASS)
return ret;
if (sqpoll_pid != -1) {
sprintf(name, "iou-sqp-%d", pid);
ret = verify_comm(sqpoll_pid, name, SQPOLL_CPU);
if (ret != T_EXIT_PASS)
return ret;
}
return T_EXIT_PASS;
}
static int test(int sqpoll)
{
struct io_uring_params p = { };
struct io_uring ring;
struct io_uring_sqe *sqe;
char buf[64];
int fds[2], ret;
cpu_set_t set;
if (sqpoll) {
p.flags = IORING_SETUP_SQPOLL | IORING_SETUP_SQ_AFF;
p.sq_thread_cpu = SQPOLL_CPU;
}
ret = io_uring_queue_init_params(8, &ring, &p);
if (ret) {
fprintf(stderr, "Queue init: %d\n", ret);
return T_EXIT_FAIL;
}
CPU_ZERO(&set);
CPU_SET(IOWQ_CPU, &set);
ret = io_uring_register_iowq_aff(&ring, sizeof(set), &set);
if (ret) {
fprintf(stderr, "register aff: %d\n", ret);
return T_EXIT_FAIL;
}
if (pipe(fds) < 0) {
perror("pipe");
return T_EXIT_FAIL;
}
sqe = io_uring_get_sqe(&ring);
io_uring_prep_read(sqe, fds[0], buf, sizeof(buf), 0);
sqe->flags |= IOSQE_ASYNC;
io_uring_submit(&ring);
usleep(10000);
ret = verify_affinity(getpid(), sqpoll);
io_uring_queue_exit(&ring);
return ret;
}
static int test_invalid_cpu(void)
{
struct io_uring_params p = { };
struct io_uring ring;
int ret, nr_cpus;
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if (nr_cpus < 0) {
perror("sysconf(_SC_NPROCESSORS_ONLN");
return T_EXIT_SKIP;
}
p.flags = IORING_SETUP_SQPOLL | IORING_SETUP_SQ_AFF;
p.sq_thread_cpu = 16 * nr_cpus;
ret = io_uring_queue_init_params(8, &ring, &p);
if (ret == -EPERM) {
return T_EXIT_SKIP;
} else if (ret != -EINVAL) {
fprintf(stderr, "Queue init: %d\n", ret);
return T_EXIT_FAIL;
}
io_uring_queue_exit(&ring);
return T_EXIT_PASS;
}
int main(int argc, char *argv[])
{
int ret;
int nr_cpus;
if (argc > 1)
return T_EXIT_SKIP;
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if (nr_cpus < 2) {
fprintf(stderr, "Requires at least 2 CPUs, found %d\n", nr_cpus);
return T_EXIT_SKIP;
}
ret = test_invalid_cpu();
if (ret == T_EXIT_SKIP) {
return T_EXIT_SKIP;
} else if (ret != T_EXIT_PASS) {
fprintf(stderr, "test sqpoll cpu failed\n");
return T_EXIT_FAIL;
}
ret = test(1);
if (ret == T_EXIT_SKIP) {
return T_EXIT_SKIP;
} else if (ret != T_EXIT_PASS) {
fprintf(stderr, "test sqpoll failed\n");
return T_EXIT_FAIL;
}
return T_EXIT_PASS;
}
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